You can try a CD/DVD Cleaner Disk ($3-$5). Some sell for $15, don't know if you'll get better results. If it doesn't work, then you have a laser alignment issue that needs calibrating. The labor is likely to cost more than a new DVD player.

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It's possible that one of the fuses have blown on the inside. Sony DVD players are known for this (Models DVP 330, 360, 560) and there are many complaints about it. They give the "No Disc" or "C-13" error. I ended up searching the internet and found people that had the same issue. I found the fuse and went to the store to find I had to buy 5 fuses because they were not sold separately. I ended up just soldering the connection knowing that it may break again any time. It works now and has been working for 4+ years since it broke. I'm not a very technical when it comes to electronics. I was just mad that my DVD player broke after the warranty expired. I originally paid $400US for the Sony DVD player. Now I can buy Sony DVD players for under $100US.

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There should be a setting on the DVD's menu for output of picture. You should look under colour settings, to see if it has got NTSC output. You should also check your TV it might not be set to NTSC aswell. You can look in the user manual of the DVD to see if says anything about NTSC playback. If you have lost the manual you can download it for free on the Panasonic website.
If it won't playback NTSC discs, I'd guess you can get an adapter from somewhere.

To unlock the DVD code its defends upon what region you belongs or from were you bought the DVD unit. Just click this site to hack the region code ; http://www.videohelp.com/dvdhacks

To keep it simple, this means that DVD players and DVDs are labeled for operation on within a specific geographical region in the world. For example, the U.S. is in region 1. This means that all DVD players sold in the U.S. are made to region 1 specifications. As a result, region 1 players can only play region 1 discs. That's right, the DVDs themselves are encoded for a specific region. On the back of each DVD package, you will a find a region number (1 thru 6). The geographical regions are as follows: REGION 1 -- USA, CanadaREGION 2 -- Japan, Europe, South Africa, Middle East, GreenlandREGION 3 -- S.Korea, Taiwan, Hong Kong, Parts of South East AsiaREGION 4 -- Australia, New Zealand, Latin America (including Mexico)REGION 5 -- Eastern Europe, Russia, India, AfricaREGION 6 -- ChinaREGION 7 -- Reserved for Unspecified Special UseREGION 8 -- Reserved for Cruise Ships, Airlines, etc...REGION 0 or REGION ALL -- Discs are uncoded and can be played Worldwide, however, PAL discs must be played in a PAL-compatible unit and NTSC discs must be played in an NTSC-compatible unit.

The end result is that DVDs encoded for regions other than Region 1 cannot be played on a region 1 DVD player, also, players marketed for other regions cannot play region 1-stamped DVDs

It's possible that one of the fuses have blown on the inside. Sony DVD players are known for this (Models DVP 330, 360, 560) and there are many complaints about it. They give the "No Disc" or "C-13" error. I ended up searching the internet and found people that had the same issue. I found the fuse and went to the store to find I had to buy 5 fuses because they were not sold separately. I ended up just soldering the connection knowing that it may break again any time. It works now and has been working for 4+ years since it broke. I'm not a very technical when it comes to electronics. I was just mad that my DVD player broke after the warranty expired. I originally paid $400US for the Sony DVD player. Now I can buy Sony DVD players for under $100US.

If your menu set-up functions do not list a Zone free setting, and the manufacturer does not offer zone free operation software code as a download, (RS-232 port to upload?) it is probably not possible to do this. Many players if they offer the multiple zone function,(different from zone free) will lock in to the most used zone after 5 or so uses (like computer DVD Players do as a function of windows). You may also have trouble with DVDs of different zones being in PAL/SECAM format and not in the NTSC format that all US TVs use, thus needing to be converted.